Jack



Aug. 3o, 1927.

o o, /o o o f o D iHH-.. H..-H..H... -1..z.-./mHH-mud- I M ma -HH FL mnc lll .|l|l|l l l lll' l l l|l|| Illllllllllllllll JIM JACK F. J. JAcKsoN Filed Jah25 1S Aug. 30. 1927.

F. .1.- JACKSON JACK Filed Jan.25, 1926 3 Sheets-Sheet 3 IO I l IO I l /I v VFI) O 1; l |O l l IO l I 721/077207 /fP/ fql JJAC/fson Y lig, a:

citta/Ney Patented Aug. 30, 1927.

yUNITED STAT-ES PATENT OFFICE.

FRED J'. JACKSON, OF MINNEAPOLIS, MINNESOTA.

JACK.

Application :tiled January 25, 1926.

grain car doors of the type in which transversely arranged sections are slidably secured in channels in the door frame. Such door sections, due tothe internal pressure of the grain in the car, are almost always so tightly secured that it is impossible -to re move them except by successively loosening and raising them with. great pressure. order to efliciently apply such pressure I have perfected the jack shown in the accom-` panying drawings, in which:

Fig. 1 is a side elevation of the jack, a portion of the lever handle and the upper end beingbroken away.

Fig. 2 is a rear or door side view of the jack as shown in Fig. 1V.

Fig. 3 is a cross sectional view on the line 3 3 in Fig. 1.

Fie'. et is a substantially central sectional elevation of the jack as shown in Fig. 1, the ratchet mechanism being adjusted for rais* ing action.

Fig. 5 is a sectional elevation substantially similar to Fig. 4, but showing the `ratchet mechanism as arranged for lowering actioi F ig. 6 is a side elevation of the jack, partly broken away, showing how'it may be employed without the extension device shown iii Figs. 1-5.

F ig. 7 is a sectional view as seen on the irregular line 7-7 in Figli.

F ig. 3 is' a sectional elevation on the irregular line 3-8 inFig. 6.

Referring to the drawings by reference characters A, B and C designate the sections of a grain car door which are to be forced open or upwardly by my improved Jack. W/hen the door is fully closed these sections abut each other, and when itis to be open it is found most practical to loosen the sections by successively raising them apart from each other, before attempting to raise them all up to completely free all the grain, rather than to exert the tremendous vforce required to raise theingall at once from their initial positions.

rIhe jack comprises a base member .10, upon which is secured a standard consisting of a pair of spaced parallel angle iron members 11 and 12, rigidly connected by channel members 13 and 14. To the backs of thev side flanges of the angle irons 11 and 12 are -securedtogetlier as by a plate 33.

Serial N0. 83,753.

secured narrow vertical strips lvand 16 and wider vertical strips 17 and18, forming with the angle irons, inwardly opposed channels which slidably receive the sides of a rack member 19 having teeth 20. The upper end of this rack is provided with a head 21 which may be applied directly under any object to Y be raised. This rachis raised and lowered by a mechanism which will later be described. vThe sides of the jack are provided with handles 24,'by which it may be'carried, while a bail is provided at its upper end by which it may be engaged by a hoist.

The backof the rack is provided with upper and lower pairs of hooks 22 and 23, adapted to carry removable pins 26 and 27 for releasable engagement with a pair of removable hooks 23 and 29, asv shownin Fig. 6. These hooks have i'ingers 30 and 31 which engage, respectively, under `the door sections B and A.y To raise a door, with this construction, the'fingers 30 and 31 are first driven undei the respective doors so that-the hooks 28 andv-29 will be held in the respect-ive positions, shown in Fig. 6. The jack is then set in place with the lifting rack in a lowered position. As the rack is then lifted up the p-in 26`first engages the hook 28, and thus moves the section B up from vabout four to eight inches before the lower pin 27 engages the hook 29 to lift the lower door section. Thus the sections will first be successively'loosened before they are klifted completely upward together.

vWith doors havingrthree or more sections, as in Figs. 1 and 5,1 prefer to use an eXtension device which will enable sections above the jack proper ,to ybe engaged and raised.

This extension consists of a frame 32 havimg a vertical pairof angle iron members Flanges of the frame irons'are provided with holes 34 in which pinsmay be selectively placed either for engaging the lifting hooks 35, and 37, or for hanging the frame on the rack hooks 22 and 23. The hooks 35 and 36 are -similar .to the previously described hooks 28 l1 which hang the frame 32 on 'the rack its initial position the handle 55 is lifted up,

hooks 22 and 23.

ln lifting a three section door, as indicated in Figs-1 5, the hooks 35, 36 and 3'? are i'irst driven under the respective door sections so as to be held in place. The frame and jack are then placed in position and the pins 38, Ll1 and 40 are inserted. As the rack 19 is now slowly raised the hook 37 will first raise the section C a predetermined distance before the pin Zl1 will engage the hook 3G. rfhe sections C and B will now be raised a short distance before the pin l0 will engage the hook 35 to loosen the section A. The jaclr will then continue to raise all the loosened door sections, A, B and C, until the desired clearance is effected.

The rack engaging, 'raising and lowering device may now be described, as follows:

A lever member, consisting of a forked casting l2 and a long handle 13, is pivotally secured as by stud bolts let between the flanges of the irons 11 and 12. The stud bolts 4:11 do not extend entirely across but only into the forlredlever arms, so as to leave room for the insertion and movement of a pair of operating pawls l5 and 16 which are pivoted in the lever 42 and on opposite sides of the center of Llei, so that when the lever is operated the pawls will be alternately raised and lowered. rlhe upper ends of the pawls 115 and a6 are engaged, respectively, by springs 417 and 48, which always tend to lieep the pawls in operating engagement with the rack teeth 2G.

A. casting 19, secured in the standard, has a stationary lip 5() which serves to limit the downward movement of the lever, and in theV casting 49 is slidably arranged a so-called reversing block 51 having teeth 52 and 53 for respective engagement with the lower ends of the pawls l5 and 116. The block 51 is raised and lowered to its respective upper and lower positions by a cam 5a operated by a hand lever 55.

fi/Then the block 51 is in its lower position, as shown in Figs. 4l, (i and 8, the jack is in a rack raising posit-ion, the teeth 52 and 53 being idle. As the lever L12-Z13 .is now ,forked up and down the upper ends of the pawls 45 and i6 are alternately engaged in successive teeth of the rack and rideV down over them by virtue of the springs i7 and 4:8. rThus when the outer end of the lever handle 113 is forced down the pawl Ll5 will move the rack up until the pawl 16 slips into engagement under the tooth it previously engaged, so that when'the handle is then raised up the pawl l'will force the raclr up untilthe pawl l5 secures a new and lowerl hold.

W hen it is desiredto lower the rack 19 to i i as indicated in Fig. 5, whereby the teeth 52 and 53 are raised to a pawl engaging position. lt will now be noticed that when the pawl 16 and hand lever Zl2-t3 are in their lowered positions the tooth 52 will hold the upper end of the pawl 4G away from the rack. As the handle 48 is then lifted the racl: 19 will follow down with the pawl 45 until the pawl a6 is released by the tooth 52 and snaps into engagement with the rack. Shortly thereafter the pawl l5 strikes the tooth 53 and is thus disengagedv from the rack until the latter is lowered and the tooth 53 disengages from the pawl 45 which then ire-engages the tooth immediately above'the one last engaged.

It is understood that suitable modifications may be made in the general design and structural details of the invention as herein shown and described, provided, however, that said modifications come within the spirit and scope of the appended claims.

YHaving now therefore fully shown and described my invention, what l claim to be new and desire to protect by Letters .Patent 1. A jack, for raising grain car doors having separable vertically movable sections, comprising a rack, means forraising the racli, section engaging devices, and means for associating the section engaging .devices with the rack whereby the upward movement of the latter will successively engage the devices to space the sections from cach other before raising the entire door. y

2. A. jack, for raisins' grain car doors having separable vertically movable sections, comprising a lifting member, a vertical series of hooks for respective engagement with said door sections, means carriedl by the lifting member for successively engaging the hooks, and means for raising the lifting member.k

3. A jacl, for raising grain car doors having separable vertically movable sections, comprising a standard, a rack vertically movable in the standard, a hand lever for raising the rack, and a series of removable hooks adaptedto be carried by the rack and successively lifted thereby independently of each other, said hooks being engageable with the respective door sections.

il. The method of raising a ,grain car door having separable vertically movable sections, which -consists in forcibly spacing the sections from each other, and then raising all the sections simultaneously and while so spaced from each other. l

ln testimony whereof l affix my signature.

yFRED J. JUaCKEaON.` 

